From patchwork Tue Mar 21 03:56:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhaotianrui X-Patchwork-Id: 13182190 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45BEDC74A5B for ; Tue, 21 Mar 2023 03:57:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229839AbjCUD5I (ORCPT ); Mon, 20 Mar 2023 23:57:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48156 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229676AbjCUD5A (ORCPT ); Mon, 20 Mar 2023 23:57:00 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 03C042E0F9; Mon, 20 Mar 2023 20:56:58 -0700 (PDT) Received: from loongson.cn (unknown [10.2.5.185]) by gateway (Coremail) with SMTP id _____8DxEzQJKxlkKDYPAA--.22575S3; Tue, 21 Mar 2023 11:56:57 +0800 (CST) Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8DxD78EKxlkQB4IAA--.33942S9; Tue, 21 Mar 2023 11:56:57 +0800 (CST) From: Tianrui Zhao To: Paolo Bonzini Cc: Huacai Chen , WANG Xuerui , Greg Kroah-Hartman , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Jens Axboe , Mark Brown , Alex Deucher , Oliver Upton , maobibo@loongson.cn, Xi Ruoyao Subject: [PATCH v4 07/29] LoongArch: KVM: Implement vcpu run interface Date: Tue, 21 Mar 2023 11:56:29 +0800 Message-Id: <20230321035651.598505-8-zhaotianrui@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230321035651.598505-1-zhaotianrui@loongson.cn> References: <20230321035651.598505-1-zhaotianrui@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8DxD78EKxlkQB4IAA--.33942S9 X-CM-SenderInfo: p2kd03xldq233l6o00pqjv00gofq/ X-Coremail-Antispam: 1Uk129KBjvJXoWxAryruFWxJryUXw43KFWxWFg_yoW5XFWUpF W8Cwn09w4rJ34xG393Jrs0vrs0qrZ5Kr17XryxtrWaqr4jy34DursakrWDAFWfA34fZF1S vFn5tF4UCF1jy37anT9S1TB71UUUUjJqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b4kFc2x0x2IEx4CE42xK8VAvwI8IcIk0rVWrJVCq3wA2ocxC64kIII0Yj41l84x0c7CEw4 AK67xGY2AK021l84ACjcxK6xIIjxv20xvE14v26w1j6s0DM28EF7xvwVC0I7IYx2IY6xkF 7I0E14v26r4UJVWxJr1l84ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aV CY1x0267AKxVW8Jr0_Cr1UM2kKe7AKxVWUAVWUtwAS0I0E0xvYzxvE52x082IY62kv0487 Mc804VCY07AIYIkI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VCjz48v1s IEY20_WwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc7CjxVAaw2AFwI0_ JF0_Jw1l42xK82IYc2Ij64vIr41l42xK82IY6x8ErcxFaVAv8VWrMxC20s026xCaFVCjc4 AY6r1j6r4UMxCIbckI1I0E14v26r126r1DMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26F1j6w1UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1lIxAIcVCF 04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26F4j6r4UJwCI42IY6I8E87Iv6x kF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvj4RKpBTUUUUU Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Implement vcpu run interface, handling mmio, iocsr reading fault and deliver interrupt, lose fpu before vcpu enter guest. Signed-off-by: Tianrui Zhao --- arch/loongarch/kvm/vcpu.c | 86 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c index 7af2ff64b..bc9e3889f 100644 --- a/arch/loongarch/kvm/vcpu.c +++ b/arch/loongarch/kvm/vcpu.c @@ -18,6 +18,44 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) return 0; } +/* Returns 1 if the guest TLB may be clobbered */ +static int _kvm_check_requests(struct kvm_vcpu *vcpu, int cpu) +{ + int ret = 0; + + if (!kvm_request_pending(vcpu)) + return 0; + + if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { + /* Drop vpid for this VCPU */ + vcpu->arch.vpid = 0; + /* This will clobber guest TLB contents too */ + ret = 1; + } + + return ret; +} + +static void kvm_pre_enter_guest(struct kvm_vcpu *vcpu) +{ + int cpu; + + /* + * handle vcpu timer, interrupts, check requests and + * check vmid before vcpu enter guest + */ + kvm_acquire_timer(vcpu); + _kvm_deliver_intr(vcpu); + /* make sure the vcpu mode has been written */ + smp_store_mb(vcpu->mode, IN_GUEST_MODE); + cpu = smp_processor_id(); + _kvm_check_requests(vcpu, cpu); + _kvm_check_vmid(vcpu, cpu); + vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY); + /* clear KVM_LARCH_CSR as csr will change when enter guest */ + vcpu->arch.aux_inuse &= ~KVM_LARCH_CSR; +} + int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) { unsigned long timer_hz; @@ -87,3 +125,51 @@ void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) context->last_vcpu = NULL; } } + +int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) +{ + int r = -EINTR; + struct kvm_run *run = vcpu->run; + + vcpu_load(vcpu); + + kvm_sigset_activate(vcpu); + + if (vcpu->mmio_needed) { + if (!vcpu->mmio_is_write) + _kvm_complete_mmio_read(vcpu, run); + vcpu->mmio_needed = 0; + } + + if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) { + if (!run->iocsr_io.is_write) + _kvm_complete_iocsr_read(vcpu, run); + } + + /* clear exit_reason */ + run->exit_reason = KVM_EXIT_UNKNOWN; + if (run->immediate_exit) + goto out; + + lose_fpu(1); + + local_irq_disable(); + guest_timing_enter_irqoff(); + + kvm_pre_enter_guest(vcpu); + trace_kvm_enter(vcpu); + + guest_state_enter_irqoff(); + r = kvm_loongarch_ops->enter_guest(run, vcpu); + + /* guest_state_exit_irqoff() already done. */ + trace_kvm_out(vcpu); + guest_timing_exit_irqoff(); + local_irq_enable(); + +out: + kvm_sigset_deactivate(vcpu); + + vcpu_put(vcpu); + return r; +}